content: /*
   * Copyright 2011-2016 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package ix;
  
  import java.util.Iterator;
  
  final class IxForloop<T, R> extends Ix<R> {
  
      final T seed;
  
      final IxPredicate<? super T> condition;
  
      final IxFunction<? super T, ? extends R> selector;
  
      final IxFunction<? super T, ? extends T> next;
  
      IxForloop(T seed, IxPredicate<? super T> condition, IxFunction<? super T, ? extends R> selector,
              IxFunction<? super T, ? extends T> next) {
          this.seed = seed;
          this.condition = condition;
          this.selector = selector;
          this.next = next;
      }
  
      @Override
      public Iterator<R> iterator() {
          return new ForloopIterator<T, R>(seed, condition, selector, next);
      }
  
      static final class ForloopIterator<T, R> extends IxBaseIterator<R> {
  
          T index;
  
          final IxPredicate<? super T> condition;
  
          final IxFunction<? super T, ? extends R> selector;
  
          final IxFunction<? super T, ? extends T> next;
  
          boolean exceptFirst;
  
          ForloopIterator(T index, IxPredicate<? super T> condition, IxFunction<? super T, ? extends R> selector,
                  IxFunction<? super T, ? extends T> next) {
              this.index = index;
              this.condition = condition;
              this.selector = selector;
              this.next = next;
          }
  
          @Override
          protected boolean moveNext() {
              T i = index;
  
              if (exceptFirst) {
                  i = next.apply(i);
                  index = i;
              } else {
                  exceptFirst = true;
              }
  
              if (!condition.test(i)) {
                  done = true;
                  return false;
              }
  
              value = selector.apply(i);
              hasValue = true;
  
              return true;
          }
      }
  }
  